Coming by way of the Game Developers Conference taking place in San Francisco this week, it looks like Peter Vesterbacka from Rovio Mobile has given an update in terms of the success of Angry Birds on Android. Of course, success may be understating this a little bit, according to Peter, Angry Birds for Android has been downloaded more than 30 million times. And perhaps more important, stats are showing that as many as 80 percent of users keep playing after the initial download and keep up with updates. Then again, given we are still playing on an almost daily basis, that last bit is not all that hard to believe.